In this paper some aspects of the deviations of frequency distributions of earthquakes from a linear trend are considered. For recurrence curves with inflexions, the formulais proposed as a magnitudefrequency relation, with critical magnitude Mcr. Comparison with actual data shows better agreement than other formulae. The slope of the frequency graph is considered in the most general case to be a function of M and some parameters p l , p z , ... .A classification of the types of magnitude-frequency relation is given and all known types of relations N : M and N : K (K = log E, E = seismic energy) are summarized.
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